
<!DOCTYPE html>
<!-- Nested fieldsets should be assigned validation correctly -->
<html>
  <head>
    <style>
      fieldset:valid { background-color: green; }
      fieldset:invalid { background-color: red; }
    </style>
  </head>
  <body>
    <fieldset style="background-color:red;">
      <fieldset style="background-color: green;">
        <input>
      </fieldset>
      <fieldset style="background-color: red">
        <input required>
      </fieldset>
    </fieldset>
  </body>
</html>

